There's a vast range of possibilities between friendly and hostile.
They may want something from us that transcends what we would normally think of as "hostile" in a human way of thinking. Perhaps we can't even comprehend what they want or why (perhaps they want our souls in whole or part).
We can only imagine them in human terms of course, but perhaps they want something more than just to be friends or enemies or eat us for dinner or kill us.
Maybe they want all our Democrats, to study brain illnesses.